[PATCH] drm/i915: initialize gen6 rps work queue for Ironlake+

[Jesse Barnes <jbarnes@virtuousgeek.org>]

Looks like I didn't merge Ben's RPS work queue stuff correctly with the
new IRQ split code (diff was sparse enough that git didn't complain).
This should prevent null derefs on ILK+ due to the missing work queue.

Signed-off-by:  Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 349a03e..9112bf5 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1736,6 +1736,7 @@ void ironlake_irq_preinstall(struct drm_device *dev)
 
 	INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
 	INIT_WORK(&dev_priv->error_work, i915_error_work_func);
+	INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
 
 	I915_WRITE(HWSTAM, 0xeffe);
 
@@ -1887,7 +1888,6 @@ void i915_driver_irq_preinstall(struct drm_device * dev)
 
 	INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
 	INIT_WORK(&dev_priv->error_work, i915_error_work_func);
-	INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
 
 	if (I915_HAS_HOTPLUG(dev)) {
 		I915_WRITE(PORT_HOTPLUG_EN, 0);